======================================
| [   13.116329][    C0] 1 lock held by swapper/0/0:
| [ 13.116528][ C0] #0: ffffffff92974480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   13.116906][    C0]
| [   13.116906][    C0] stack backtrace:
[   13.117162][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.117164][    C0] Call Trace:
[   13.117166][    C0]  <IRQ>
[ 13.117168][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.117175][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 13.117181][ C0] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 13.117184][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 13.117188][ C0] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 13.117192][ C0] ? save_trace (kernel/locking/lockdep.c:594) 
[ 13.117198][ C0] mark_lock (kernel/locking/lockdep.c:4754) 
[ 13.117202][ C0] mark_usage (kernel/locking/lockdep.c:4643) 
[ 13.117204][ C0] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 13.117209][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 13.117211][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.117216][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.117220][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 13.117222][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.117225][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.117229][ C0] ? simple_pin_fs (fs/libfs.c:1066) 
[ 13.117231][ C0] simple_pin_fs (fs/libfs.c:1066) 
[ 13.117235][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.117239][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.117245][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.117249][ C0] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.117254][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.117257][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.117261][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.117264][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.117268][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.117272][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.117275][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.117278][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.117280][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.117283][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.117286][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.117288][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.117290][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.117297][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.117300][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.117304][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.117307][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.117311][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.117315][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.117319][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.117322][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.117326][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.117330][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.117334][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.117342][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.117347][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.117350][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.117356][    C0]  </IRQ>
[   13.117358][    C0]  <TASK>
[ 13.117361][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.117366][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.117374][ C0] Code: a0 b7 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d a3 a0 12 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	a0 b7 00 c3 cc cc cc 	movabs 0xfccccccccc300b7,%al
   7:	cc 0f 
   9:	1f                   	(bad)
   a:	00 90 90 90 90 90    	add    %dl,-0x6f6f6f70(%rax)
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d a3 a0 12 00 	verw   0x12a0a3(%rip)        # 0x12a0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   13.117379][    C0] RSP: 0018:ffffffff92607df8 EFLAGS: 00000246
[   13.117384][    C0] RAX: 000000000005f933 RBX: 1ffffffff24c0fc3 RCX: ffffffff91968a19
[   13.117387][    C0] RDX: 0000000000000000 RSI: ffffffff924881e1 RDI: ffffffff91c50e20
[   13.117389][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e8667a
[   13.117391][    C0] R10: ffff88802f4333d3 R11: 0000000000000000 R12: 0000000000000000
[   13.117393][    C0] R13: ffffffff9261f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.117397][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.117403][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.117406][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.117408][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.117412][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.117415][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.117420][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.117423][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.117425][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.117428][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.117432][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 13.117436][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (discriminator 17)) 
[ 13.117440][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.136342][    C0] RCU nest depth: 0, expected: 0
| [   13.136535][    C0] INFO: lockdep is turned off.
| [   13.136729][    C0] Preemption disabled at:
| [ 13.136731][ C0] schedule_preempt_disabled (kernel/sched/core.c:6919) 
[   13.137164][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.137166][    C0] Call Trace:
[   13.137168][    C0]  <IRQ>
[ 13.137170][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.137176][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 13.137183][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.137186][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.137189][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 13.137194][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 13.137198][ C0] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 13.137204][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 13.137207][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.137212][ C0] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 13.137217][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.137220][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 13.137225][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.137229][ C0] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.137234][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.137239][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.137242][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.137246][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 13.137252][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.137257][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.137261][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.137265][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.137267][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.137270][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 13.137273][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.137275][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.137278][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.137286][ C0] __put_net (net/core/net_namespace.c:732) 
[ 13.137289][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 13.137293][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.137296][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 13.137300][ C0] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 13.137305][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 13.137309][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.137314][ C0] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 13.137317][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 13.137322][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 13.137326][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 13.137330][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.137333][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.137335][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   13.137339][    C0]  </IRQ>
[   13.137340][    C0]  <TASK>
[ 13.137341][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.137344][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 13.137348][ C0] Code: a0 b7 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d a3 a0 12 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	a0 b7 00 c3 cc cc cc 	movabs 0xfccccccccc300b7,%al
   7:	cc 0f 
   9:	1f                   	(bad)
   a:	00 90 90 90 90 90    	add    %dl,-0x6f6f6f70(%rax)
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d a3 a0 12 00 	verw   0x12a0a3(%rip)        # 0x12a0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   13.137350][    C0] RSP: 0018:ffffffff92607df8 EFLAGS: 00000246
[   13.137354][    C0] RAX: 000000000005f933 RBX: 1ffffffff24c0fc3 RCX: ffffffff91968a19
[   13.137356][    C0] RDX: 0000000000000000 RSI: ffffffff924881e1 RDI: ffffffff91c50e20
[   13.137358][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e8667a
[   13.137360][    C0] R10: ffff88802f4333d3 R11: 0000000000000000 R12: 0000000000000000
[   13.137361][    C0] R13: ffffffff9261f240 R14: dffffc0000000000 R15: 0000000000014770
[ 13.137365][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.137370][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 13.137374][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.137376][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.137379][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.137382][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 13.137387][ C0] do_idle (kernel/sched/idle.c:325) 
[ 13.137390][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.137393][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 13.137396][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 13.137399][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 13.137404][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (discriminator 17)) 


Finger prints:
schedule_preempt_disabled:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock